I've mentioned the Quilters Slide-lock ruler on the Board several times and said it is the best investment ever. If you have carpal tunnel or arthritis, it is a must-have because you don't have to put so much pressure on your wrists and hands to use it. I do as the video suggests - place my ruler at the edge to cut, then put my slide-lock in place and cut. Sometimes I use my Martelli cutting mat for a guide, but I prefer using a ruler and the slide-lock. It is definitely worth the money. I bought mine at a quilt show where their company was a vendor. I plan to get the 14" size next.